forms

Development

Angular forms: Signal Forms (experimental) and Reactive Forms. Trigger: When working with forms, validation, or form state in Angular.

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How to use this skill

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/forms-jantoniofc-skillsbank/SKILL.md

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When to Use What

Use Case	Recommendation
New apps with signals	Signal Forms (experimental)
Production apps	Reactive Forms
Simple forms	Template-driven

Signal Forms (v21+, experimental)

import { form, FormField, required, email } from '@angular/forms/signals';

@Component({
  imports: [FormField],
  template: `
    <form>
      <input [formField]="emailField" type="email" />
      <input [formField]="passwordField" type="password" />
      <button (click)="submit()">Login</button>
    </form>
  `
})
export class LoginComponent {
  readonly loginForm = form({
    email: ['', [required, email]],
    password: ['', required]
  });
  
  readonly emailField = this.loginForm.controls.email;
  readonly passwordField = this.loginForm.controls.password;
  
  submit() {
    if (this.loginForm.valid()) {
      const values = this.loginForm.value();
    }
  }
}

Signal Forms Benefits

Automatic two-way binding
Type-safe field access
Schema-based validation
Built on signals

Reactive Forms (production)

import { FormBuilder, Validators, ReactiveFormsModule } from '@angular/forms';

@Component({
  imports: [ReactiveFormsModule],
  template: `
    <form [formGroup]="form" (ngSubmit)="submit()">
      <input formControlName="email" type="email" />
      <input formControlName="password" type="password" />
      <button type="submit" [disabled]="form.invalid">Login</button>
    </form>
  `
})
export class LoginComponent {
  private readonly fb = inject(FormBuilder);

  form = this.fb.nonNullable.group({
    email: ['', [Validators.required, Validators.email]],
    password: ['', [Validators.required, Validators.minLength(8)]],
  });
  
  submit() {
    if (this.form.valid) {
      const { email, password } = this.form.getRawValue();
    }
  }
}

Key Points

ALWAYS use fb.nonNullable.group() for type safety
Use getRawValue() to get typed values
Reactive Forms are synchronous (easier to test)

Nested Forms & FormArray

form = this.fb.nonNullable.group({
  name: [''],
  address: this.fb.group({
    street: [''],
    city: [''],
  }),
  phones: this.fb.array([this.fb.control('')]),
});

get phones() {
  return this.form.get('phones') as FormArray;
}

addPhone() {
  this.phones.push(this.fb.control(''));
}